Last Updated: Nov 30, 2016
Each year the U.S. Department of State publishes "Country Reports on Terrorism." In the report for each year you will find a chapter on "Foreign Terrorist Organizations." This chapter lists and describes the terrorist organizations.
Jane's, includes a module on Terrorism and Insurgency that provides information on individual terrorist organizations. From the Jane's home page, click on Products, then on Terrorism and Insurgency, then on World Insurgency and Terrorism.
The library has numerous books on various terrorist groups and organizations, so be sure to search the catalog for these. You may also find journal articles and other papers describing groups you are interested in, using various library databases such as ProQuest, CIAO, and others. A good starting place to identify relevant resources would be our Terrorism Research Guide.